Separable attachment-plug.



H'. HUBBE-LL. SBPABABLE ATTACHMENT PLUG.

APPLICATION FILED JUNE'S, 1908.

Patented Dec. 21, 1909.

UME

Witnesses: f, w. @Samar w'. lng/T327 UNITED sTATEs PATENT oEEroE.

vHABTEIY HUBBELL, OFBRIDGEPORT, CONNECTICUT.

'SEPARABLE ATTACHMENT-PLUG.

Application filed June 5, 1908. Serial No. 436,829.

Specicaton of Letters Patent.

Patented Dec. 21, 1969.

To all whom 'it 'may concern:

Be known that I, HARVEY I-IUBBELL, a citizen of the United States, residing at Bridgeport, county of Fairfield, State ot Connecticut, have invented a new and useful Separable Attachment-Plug, of which the central stem orpost which is itself a contact and which serves also as a support for the other contact, both contacts in the en@ gagedpositionmbeing wholly within the base and being inclosed within the screw shell. I also provide a recess in the cap inwhich the end of the cable is abutted or seated, thev wires extending forward and being attached to thc binding posts. This enables me by drawing the wires inward tightly to rmly anchor the cable in the cap lnstead of passing it through the cap in the usual manner.

With these 'and other objects in view I have devised the simple and novel separable attachment plug of which the following description in connection with the accompanying drawing is a specification, reference characters being used to indicate the several parts.

I Figure 1 is a longitudinal section of the plug complete with the base and cap'in the engaged position, the line of the section being indicated by l-l in Fig. 3 and the view being in the direction of the arrows; Fig. 2 a view of the cap detached, partly in elevation and partly in section on the line 2 2 in Fig. 3, looking in the direction of the arrows; Fig. 3 an inverted plan view of the cap; Fig. 4 a plan view of the base; and Fig. 5 is a perspective of a spring contact ring detached.

10 denotes the base and 1 1 the cap. The base comprises an insulating body, indicated by 12, which is provided with a central longitudinal recess, indicated by 13S On the'outer side of the base at the bottom is a center Contact 14 held in place by a screw l5 which passes through the wall of the body and engages and retains in place a plate 16 which carries a plurality of contact springs 17, four in the present instance. Upon the outer sideof the body is a screw shell .18, as an Edison screw shell, retained in place by a' screw 19 whichalso engages a hub 20 carrying a contact ring 21 which lies in the central recess. This Contact ring may `or may not be a spring ring, as will be more fully explained.

22 denotes a slot leading inward from the top` of the body and communicating with 'the central recess which receives hub 20 in assembling.

The cap vis shown as provided in its under f side with arecess 23 in which are secured brackets 24 and 25. These brackets are secured in place by screws 26 and each carries a binding screw 27 to which the wires 28 are attached. Bracket 24 carries a stem or post 29 which in the engaged position extends downward into recess 13 in the base and is' provided with a head 30 which engages contact springs 17, the head being shownas enlarged so as to insure a iirm engagement with the contact springs which are curved inward slightly to retain the head, as clearly shown in Fig. 1. Outside of the stem and secured thereto is an insulating bushing 3l. As shown in the drawing, bracket 24 may be recessed into the upper end of the insulating sleeve so as to insure perfect insulation from the other wire.

32 denotes a contact sleeve carried by bracket 25 and lying outside of the insulating bushing. This sleeve passes within contact ring 21 in the connected position, as clearly shown in Fig. l. Either sleeve 32 or contact ring 21, or both, may be made resilient so as to closely engage the other part. In the present instance I have shown the contact ring as provided with a transverse cut 33 which permits the ring to expand slightly when the sleeve is passed through and 4 showing them detached. In making a connection, the head 30 of stem or post 29-A engages contact springs 17, and'contact ring 21 which is electrically connected with the screw shell engages sleeve 32. Suppose the left wire in Fig. 1 to be the positive or incoming wire and the right Wire to be the negative or outgoing wire. The current passes to the left binding screw and through bracket 24, the stem and contact springs17 to the center contact. The return current comes in the usual manner to the screw shell and passes through hub 20, contact ring 21,

sleeve 32, bracket 25 and the right bindingv insulating cap having in upper side a recess, a cable having its end seated on the bottom of said recess and)havingwires eX-' tendingvtherefrom and passing through the cap, brackets secured to the under slde of said cap to which the dwires are connected, said Wires being drawn tightly to hold the vcable end seated as described, a stem carried by one of saidA brackets, an insulating sleeve surrounding said stem and a contact sleeve carried by the other bracket exterior to the insulating sleeve.

In testimony whereof I a'ix my slgnature, in presence of two Witnesses.

y HARVEY HUBBELL. Witnesses:

A. M. Woos'rER,

S. W. ATHEBTON. 

